26 Illinois 'State Laboratory of Natural History. 



depressed-canaliculate above, convex and green or at length 

 purple beneath; margins usually purple, thickened, sub-ascend- 

 ing, hirsute-ciliate, with crowded, short, thick, obtuse, ichite, 

 spine-like hairs, obsolete in young states; fruit sparse, scattered 

 chiefly near the base of the divisions; spores about 0.071 0.088 

 mm. in diameter, dark brown, reticulate, not margined. 



Hob. Cultivated fields and rocky ground ; N. J. to 111. and Fla. 

 Bib. Pro. Phil. Acad. 1869, p. 232. 

 Exsic. Hep. Bor.-Amer. No. 143. 



12. R. Californica Aust. MS. Divisions of thallus ex- 

 panded at apex, obcordate, cuneate, ciliate only at or toward 

 the apex or sometimes almost entirely naked on the margins: 

 spores as in R. Lescuriana which this species resembles. 



Hob Cal. (Bolander). 

 Bib Torre? Bull. VI, p. 46. 



13. R. ciliata Hoffm. Thallus dichotomously or sub- 

 stellately divided; divisions linear or cuneate, obtuse, subemar- 

 ginate, subcanaliculate at the apex; cilia very long, slender and 

 fuscous, spores about as in R. Lescuriana. 



Hab. With Fossombronia longiseta from Cal. (Bigelow). (Eu.) 

 Bib. Syn. Hep. p. 602, Hep. Europ. p. 168. 

 Delin. Lindenberg Monog. Ric. t. XXIII. 



14. R. intumescens Bisch. Thallus bifurcately lobed; 

 lobes very tumid, subcuneate-linear or subcuneate-oblong, deep- 

 ly and narrowly canaliculate, cinereous green, reticulate only 

 in the groove, which does not occupy more than ^ of the ap- 

 parent upper surface, very dark purple (almost black) beneath, 

 emitting rootlets only along the middle; the whole surface of 

 the thickened and strongly inflexed margins densely clothed ivith 

 long, appressed, white, slender, spine-like hairs, which in the dry 

 state meet over the groove and entirely conceal it; spores brown, 

 very finely reticulated, not margined. (R. tumida Lindenb. ) 



Hob Rocky ground ; Cal. (Bolander). (Eu.) 

 Bib. Syn. Hep. p. 603, Hep. Europ. p. 169. 

 Delin. Lindenberg Monog. Ric. t. XXVII. 

 Exsic. Hep. Bor.-Amer. No. 143 b. 



**** Thallus squamous beneath, squamous or squamous-ciliate 

 on the margin, with a distinct costa. 



